<template>
      <!-- 商品分类导航 -->
    <div class="type-nav">
      <div class="container">
        <div @mouseleave="mouseOutDiv" @mouseenter="isShow = true"> 
          <h2 class="all">全部商品分类</h2>
          <transition name="sort">
            <div class="sort" v-show="isShow">
            <div class="all-sort-list2" @click="toSearch">
              <div 
              class="item" 
              :class="{'item-on': currentIndex === index}" 
              v-for="(item,index) in categoryList" 
              :key="item.categoryId" 
              @mouseenter="moveInItem(index)">
                <h3>

                  <a href="javascript:;" :data-category1Id="item.categoryId" :data-categoryName="item.categoryName">{{item.categoryName}}</a>
                </h3>
                <div class="item-list clearfix">
                  <div class="subitem">
                    <dl class="fore" v-for="item2 in item.categoryChild" :key="item2.categoryId">
                      <dt>

                  <a href="javascript:;" :data-category2Id="item2.categoryId" :data-categoryName="item2.categoryName">{{item2.categoryName}}</a>
                      </dt>
                      <dd>
                        <em v-for="item3 in item2.categoryChild" :key="item3.categoryId">

                  <a href="javascript:;" :data-category3Id="item3.categoryId" :data-categoryName="item3.categoryName">{{item3.categoryName}}</a>
                        </em>

                      </dd>
                    </dl>
                  </div>
                </div>
              </div>

            </div>
            </div>
          </transition>
        </div>     
        <nav class="nav">
          <a href="###">服装城</a>
          <a href="###">美妆馆</a>
          <a href="###">尚品汇超市</a>
          <a href="###">全球购</a>
          <a href="###">闪购</a>
          <a href="###">团购</a>
          <a href="###">有趣</a>
          <a href="###">秒杀</a>
        </nav>       
      </div>
    </div>
</template>

<script>
import { mapState } from 'vuex';
import throttle from 'lodash/throttle';
export default {
  name: 'TypeNav',
  data() {
    return {
      currentIndex: -1,
      isShow: true,
    };
  },
    mounted() {
    // this.$store.dispatch("getCategoryList");
    if (this.$route.path !== '/home') {
      this.isShow = false;
    }
  },
  methods: {
    // 节流
    moveInItem: throttle(function(index){
      this.currentIndex = index
      // console.log(index);
    },20,{trailing:false}),
    
    toSearch(event) {
      //拿出事件，解构赋值
      let data = event.target.dataset;
      let {category1id,category2id,category3id,categoryname } = data;

      //判断是否为需要的a标签，调用自定义属性  data-，注意大小写
      if(categoryname){
        let path = {
          name: 'Search'
        };
        let query = {
          categoryName: categoryname,
        };
          // 添加三级数据
        if (category1id) {
          query.category1Id = category1id;
        }else if(category2id){
          query.category2Id = category2id;
        }else {
          query.category3Id = category3id;
        };
          //将数据存入路径，使用编程导航进行路由跳转
        path.query = query;


        // 跳转，合并参数
        if (this.$route.params) {
          path.params = this.$route.params;
          
        };
        if(this.$route.path !== '/home') {
          this.$router.replace(path);
        }else {
          this.$router.push(path);
        }
      }


    },

    mouseOutDiv() {
      this.currentIndex = -1;
      if (this.$route.path !== '/home') {
        this.isShow = false;
    };
    }
  },
  // 从vuex拿数据，都在computed
  computed: {
    ...mapState({
       categoryList: state => state.home.categoryList,
    })
  }
}
</script>

<style lang="less" scoped>
        .type-nav {
        border-bottom: 2px solid #e1251b;

        .container {
            width: 1200px;
            margin: 0 auto;
            display: flex;
            position: relative;

            .all {
                width: 210px;
                height: 45px;
                background-color: #e1251b;
                line-height: 45px;
                text-align: center;
                color: #fff;
                font-size: 14px;
                font-weight: bold;
            }

            .nav {
                a {
                    height: 45px;
                    margin: 0 22px;
                    line-height: 45px;
                    font-size: 16px;
                    color: #333;
                }
            }

            .sort {
                position: absolute;
                left: 0;
                top: 45px;
                width: 210px;
                height: 461px;
                position: absolute;
                background: #fafafa;
                z-index: 999;

                &.sort-enter {
                  height: 0;
                  opacity: 0;
                }
                &.sort-enter-active {
                  transition: all 1s;
                }
                &.sort-enter-to {
                  height: 461px;
                  opacity: 1;
                }

                .all-sort-list2 {
                    .item {
                        h3 {
                            line-height: 30px;
                            font-size: 14px;
                            font-weight: 400;
                            overflow: hidden;
                            padding: 0 20px;
                            margin: 0;

                            a {
                                color: #333;
                            }
                        }

                        .item-list {
                            display: none;
                            position: absolute;
                            width: 734px;
                            min-height: 460px;
                            background: #f7f7f7;
                            left: 210px;
                            border: 1px solid #ddd;
                            top: 0;
                            z-index: 9999 !important;

                            .subitem {
                                float: left;
                                width: 650px;
                                padding: 0 4px 0 8px;

                                dl {
                                    border-top: 1px solid #eee;
                                    padding: 6px 0;
                                    overflow: hidden;
                                    zoom: 1;

                                    &.fore {
                                        border-top: 0;
                                    }

                                    dt {
                                        float: left;
                                        width: 54px;
                                        line-height: 22px;
                                        text-align: right;
                                        padding: 3px 6px 0 0;
                                        font-weight: 700;
                                    }

                                    dd {
                                        float: left;
                                        width: 600px;
                                        padding: 3px 0 0;
                                        overflow: hidden;

                                        em {
                                            float: left;
                                            height: 14px;
                                            line-height: 14px;
                                            padding: 0 8px;
                                            margin-top: 5px;
                                            border-left: 1px solid #ccc;
                                        }
                                    }
                                }
                            }
                        }

                        &.item-on {
                          background-color: #ccc;
                            .item-list {
                                display: block;
                            }
                        }
                    }
                }
            }
        }
    }
</style>